Scientists hoping to elucidate the origin of human stone tool manufacture and use have looked to extant primate species for possible clues. Although some skepticism has been raised, there is clear evidence that today's capuchin monkeys can make and use stone tools.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5429872PMC
http://dx.doi.org/10.3758/s13420-016-0257-7DOI Listing

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